This ROV bilge pump thruster is designed to work with the SOAR bilge pump thruster mount. It uses the Master Air Screw MA3200 and a 10-24 x 1" bolt to connect to the bilge pump shaft. The blade are printed upright allowing them to print without support material on the blade. The blades are symmetrical because we have found that we need equal thrust forward and reverse for ideal turning. We are willing sacrifice a little forward thrust for more thrust in reverse. Propeller assembly design inspiration comes from Ole Godø at homebuiltrovs.com. A three blade design is also available. Print the two blades, top cap and base cap. Assemble, and mount to a Master Airscrew MA3200 propeller adapter using a 10-24 x 1" bolt.